I have check the libcurl code and it is calling Curl_ssl_init() only once on call from curl_global_init() and Curl_ssl_cleanup() once on call from curl_global_cleanup().
On Mon, Feb 27, 2012 at 10:31 PM, Keyoor Khristi <[email protected]>wrote: > Is it multithreaded curl? one version of the curl i used was doing > openssl_init and cleanup in its init and cleanup routines and it was not > multithreaded. result was my code would not work properly if curl_cleanup > is called before. > > > On Mon, Feb 27, 2012 at 7:52 PM, Anurag Shukla > <[email protected]>wrote: > >> I am facing some random crash issues using libcurl with openssl in a >> Multi threaded program. I wrote a sample code to create 2 threads that will >> ping to https://www.google.com. >> Using [libcurl- 7.21.7] [openssl- 1.0.0d] >> >> I have implemented the two callbacks function required by openssl >> >> #include <nspr.h> >> #include "curl.h" >> #include "openssl/crypto.h" >> static PRRWLock *lockarray[CRYPTO_NUM_LOCKS]; >> >> static void ChangeLockStatus(int mode, int lock_index, const char* >> file_name, int line_num) { >> if (mode & CRYPTO_LOCK) { >> if(mode & CRYPTO_WRITE) { >> PR_RWLock_Wlock(lockarray[lock_index]); >> } else if (mode & CRYPTO_READ) { >> PR_RWLock_Rlock(lockarray[lock_index]); >> } >> } else { >> PR_RWLock_Unlock(lockarray[lock_index]); >> } >> } >> static unsigned long ID_Callback(void) { >> unsigned long td = ::GetCurrentThreadId(); >> return td; >> } >> static void Initialize() { >> int i; >> for (i = 0; i < CRYPTO_NUM_LOCKS; i++) { >> lockarray[i] = PR_NewRWLock(PR_RWLOCK_RANK_NONE, "a"); >> } >> CRYPTO_set_locking_callback(ChangeLockStatus); >> CRYPTO_set_id_callback(ID_Callback); >> } >> void Test(void *arg) { >> int error_code; >> FILE *fd = fopen("a.txt", "w"); >> while(1) { >> CURL * curl_connection = curl_easy_init(); >> curl_easy_setopt(curl_connection, CURLOPT_TIMEOUT, 300); >> curl_easy_setopt(curl_connection, CURLOPT_CONNECTTIMEOUT, 60); >> curl_easy_setopt(curl_connection, CURLOPT_FOLLOWLOCATION, 1); >> curl_easy_setopt(curl_connection, CURLOPT_VERBOSE, 0); >> curl_easy_setopt(curl_connection, CURLOPT_SSL_VERIFYPEER, 0); >> error_code = curl_easy_setopt(curl_connection, CURLOPT_PROXY, " >> 192.168.1.1:8000"); >> curl_easy_setopt(curl_connection, CURLOPT_FILE, fd); >> curl_easy_setopt(curl_connection, CURLOPT_URL, " >> https://www.google.com";); >> error_code = curl_easy_perform(curl_connection); >> curl_easy_cleanup(curl_connection); >> Sleep(3000); >> } >> } >> int main(int argc, char** argv) { >> curl_global_init(CURL_GLOBAL_ALL); >> Initialize(); >> PRThread *threads[2]; >> for(int i=0; i<2; i++) { >> threads[i] = PR_CreateThread(PR_USER_THREAD, Test, NULL, >> PR_PRIORITY_LOW, >> PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 1024*10); >> } >> Sleep(3600000); >> curl_global_cleanup(); >> for (int i = 0; i < CRYPTO_NUM_LOCKS; i++) { >> PR_DestroyRWLock(lockarray[i]); >> } >> } >> >> When i ran this under Intel Parallel Studio to check for race conditions >> ,it gave a lot of race conditions in ssluse.c >> >> >> View Source >> >> BIO *bio_out = BIO_new(BIO_s_mem()); >> >> ssl_seeded = TRUE; >> >> >> Any idea what am i doing wrong? >> >> Thanks,<br> >> Anurag Shukla >> >> >> >> >> >> >> [1]: http://i.stack.imgur.com/hMuss.png > > >
